Process of making anhydrous tetrachlorid of tin from dioxid of tin.



F. BRKUNLIGH.

PROCESS OF MAKING ANHYDROUS TETRAOHLOBID 0P TIN FROM DIOXID 0P TIN. APPLICATION FILED JAN.13, 1912.

1,039,356. Patented Sept. 24, 1912 a &' J' a I l Mine-uses Inventor %& I'flrunlz'ch Attorney a rnn'r orrroa.

' rnrrz BaAUNLIom-or Batman AUSTRIA-HUNGARY.

.rnocnss or MAKING ANHYDR OUS TETBACHLOBID OF TIN FROM 'DIOXID OF T11 Specification of Letters Patent. Patented Sept. 24,1912.

Application filed January 13, 1912. Serial No. 671,121.

The subject-matter of my invention is an improved process of making anhydrous tetrachloridof 'tin from dioxid of tin.

I have foundthat dioxid of tin, SnO is directly and quantitatively converted into tetrachlorid of tin, SnCh, when the finely pulverized, preferably movmg oxid is subjected at an elevated. temperature to the action of acetylene andclorin.- The reaction takes place without difliculty, finely dividcd carbon or soot being separated in the reaction chamber.

My process may be carried into practice, for example, by exposing at an elevated temperature, finely pulverized anhydrous di oxidof tin, mixed or briqueted eitherby itself or with an indifferent material, and

contained in a receptacle provided with an agitating device, to the successive or simultaneous or alternate action of dry acetylene and gaseous chlorin until it is completely converted into the chlorid. The tetrachlorid of tin which distils over is collected in well cooled receivers and rectified until it-is completely purified. -In order to' preclude the danger of explosion, and with the simultaneous reaction of acetylene and chlorin,

I the introduction of the two gases can be so eflc'ected that their-mixture only takes, place within the pulverized SnO,-perhaps under pressure-whereby, due to the lack of sufficlent explosion space, explosions cannot occur. In the successive or alternate reaction of acetylene and chlorin, one gas can, for the same purpose be expelled previously by an inertgas, for instance, nitrogen, as it is possible to conduct the entire process in a vacuum or in the presence of an inert gas.

The soot collected in the reaction chamber is purified and employed as such.

through this pipe 0.

' The accompanying drawing shows a central vertical section of an apparatus which has been found suitable for carrying out this process In a cylindrical iron receptacle a, which is coated inside with a material which is not attacked by chlorin, an agitator Z) is rotatably mounted and is actuated vby'means of a belt pulley b which is keyed upon the pro longed end of its shaft.

of the cylindrical receptacle a are provided 1) an upright feed hopper 0 through which the cylindrical receptacle a is continuously supplied with SnO (dioxid of tin), (2) an upright tube at in which is inserted a pipe (Z through which acetylene is introduced into the apparatus. The wall of the pipe (1 is pierced by a bent pipe 6 which also opens into the upright tube d. .Chlorin is introduced Acetylene and chlorin can be introduced simultaneously or alternately, and also (3) an upright tube f through which the .tctrachlorid of tin which forms (snC can escape to the open. On the lower side of the cylindrical receptacle (1- is provided a pipe 9 through which the soot which forms is withdrawn. The cylindrical rece )tacle a. rests preferably on masonry or -the ike i, in the forward part of which is provided a fire place It by'which the receptacle a is heated and hence its contents brought to a higher temperature.

The suitable temperature at which the process is carried out isfrom .200 to 400 ccntigrade.

The reaction isexpressly the following equation:' I SnO. .}C.,H. }-3Cl SnGl,+2-IICL+C+CO,

I claim 7 1. The hereindescribed process of making anhydrous tetrachlorid of tin, which con sists in exposing dioxid of tin at an elevated temperature to the action of acetylene and chlorin.

2. The hereindescribed' recess of making anhydrous tetrachlorid 0 tin, which consists in exposing dioxid of tin at an elevator At the upper side temperature to the successive action of acetylene and chlorin.

3. The hereindescribed process of making anhydrous tetrachlcrid of tin, which con sists in exposing dioxid of tin at an elevated temperature to the alternating action 0ft acetylene and chlorin.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.-

FRITZ BRAUNLICH.

Witnesses MQRITZ SOHMOLKA, RUDOLF HARTOCHEA.

Qopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washingtomlk G. 

